I am running FSX on my MacBook Pro currently. I would like to know if I would see more FPS if I were to invest in Prepar 3D at a complex add on airport such as Fly Tampa Boston in the NGX. Has anyone had experience with more performance under a larger load with P3D? If it's not worth my money please let me know.

Very little difference: http://simmerhead.wordpress.com/2012/02/23/the-benchmark-flight-simulator-x-acceleration-vs-prepar3d-v1-2/

 

That said, the latest P3D update might have improved things.

Mate, there really isn't much point. Your settings will STILL have to be turned down super low for that, and I kid you not, you will see a MAX of about 2 or so FPS. At least, that's what my experience was. Most of the time there really isn't much difference anyway.

See here for some 1:1 compares in V1.4:

 

http://#####...nce-comparison/

Cool, that gave me my answer thanks a lot guys!

I find a combination of higher frame rates with much better visuals at payware airports like LFPG and EDDF, I had not had this good visuals with no stuttering until I migrated to P3D, so just like FSX, I think the experience may vary from one user to the next.

Also found that moving autogen from very dense to dense gave me nearly 10 extra fps!!